First of all,I am not the creator of this mod,the mod's creator is Soares93 from mohaaaa.co,I just upload this mod to moddb and share to you.If you want to playing this mod with my HD mod"Surgical operation",please remove file(from Surgical operation) "zzzz_weapon.pk3"and "zzzzzzzzzzzzzz__Experience_Effects.pk3"away from the "MAIN" folder .
The mod link in mohaaaa.co: Mohaaaa.co.uk
Here is the mod'info from moh mohaaaa.co:
This mod will add more ww2 weapons to your inventory, this is the firts major update in this mod. It still has bugs but all the sounds are installed and some weapons had minor fixes and have new awsome reskins. You can try all the extra weapons in the 'Basic Training' level or play the entire campaign to try each one of them. Lt. Powel somehow gets japanese weapons in Normandy lol. This mod gatters files from all over the internet, the only credit I take is for some minor fixes in the models and new textures. To install place the 'zzzS93_extra_weapons_update1.pk3' in your 'MAIN' folder.
To unninstall just delete the file from your 'MAIN' folder.
Hope you enjoy and leave a comment 
You can try all the extra weapons in the 'Basic Training' level (not all weapons screenshots):
